NEMO (NEw MOrtar), is a single 120 mm unmanned mortar turret currently being developed by Patria Weapons System Oy in Finland.
It is a lighter version of the AMOS mortar system, which is also being field tested.
The NEMO can be fitted to most APCs and also to smaller landing craft, like the Finnish Jurmo class landing craft or the Swedish Combat Boat 90.
The first customer of the weapon system will be the Slovenian Army.

I personally just love mortars the 81 mm mortars are just invaluable as far as mountain warfare is concerned

In mountain warfare ie for example India China border if you want to cut off and surround the enemy
then you have to get behind the enemy and prevent them from escaping as well as prevent new supplies
from reaching them

In such case A light weapon like 81 mm mortars are very useful

120 mm are heavy though Infact 105mm artillerry weigh as much as 120 mm mortars with more range

1996 the Russian Motovilikha Plants Corporation fielded the latest of its Nona family, the 2S31 Vena, an automated self propelled mortar, with a longer barrel, (Russian 120mm 2A80) also firing the Gran laser-guided bomb against point targets to 13km range.

NEMO (NEw MOrtar), is a single 120 mm unmanned mortar turret currently being developed by Patria Weapons System Oy in Finland. It is a lighter version of the AMOS mortar system, which is also being field tested. The NEMO can be fitted to most APCs and also to smaller landing craft, like the Finnish Jurmo class landing craft or the Swedish Combat Boat 90.

The 120-mm 2S9 Nona-S (Anemone) self-propelled howitzer/mortar was first seen in public in May 1985 and it is an airborne artillery assault vehicle that has been developed to carry out two tactical functions:

The 120 KRH 92 (Finnish: 120 mm kranaatinheitin, malli 1992) is a 120 mm mortar manufactured in Finland.Due to the high trajectory, high rate of fire, and their light weight, mortars are especially suited to terrain with natural cover, in built-up areas and in circumstances with great altitude differences.

The Soltam M-65 is a 120 mm mortar that was developed by Tampella in 1953 via introduction of new baseplate for 120 Krh/40 invented by Hans Otto Donner. In 1960s Soltam Systems of Israel bought a license. The mortar system comes in two versions, a standard mortar and a long-range version.

Japan was on the brink of defeat. Last ditch defenses were being prepared. The Emperor would not let his island nation fall easily. They, the Japanese people, would fight to the last man, woman and child. Facing astounding odds in combat and unprecedented fortification efforts, the United States faced an invasion of Japan with much trepidation.

To break these anticipated sieges and Herculean defense works of the Japanese, the United States military looked to siege warfare to create a weapon designed to decimate defenses with devastating and overwhelming power. The Little David 914mm mortar is history's largest diameter artillery piece.

The massive piece, with a tube 22 feet long, was supposed to be towed into battle via two large prime mover trucks. The tube was towed by one truck and the mortar base assembly was brought to the field by another. The base alone, weighing in at 46 tons, dwarfed a soldier standing beside it.

The Little David was never designed to sit on flat ground. To the contrary, combat engineers were needed to prepare the ground by digging a 12 foot deep trench floored by railroad timbers for the weapon placement. Once in the trench, earth was back-filled around the Little David base, with additional railroad ties and dirt tamped to further hold the mortar.

The tube was then backed over the now level base assembly, with hydraulic jacks rising from the base to engage the mortar trunnions, allowing the truck to pull away and the mortar to be seated on the base.

Once placed and secured, the Little David projectile, weighing 3,650 pounds was placed in the mortar tube by a crew. The projectile was seated atop a propellant bag at the weapon's base. Raised and traversed to target coordinates, the Little David tube was hydraulically pumped upwards into battery.

Upon firing, the tube recoiled two feet backwards, propelling the three ton shell to distances as far as six plus miles at a velocity of 1,200 feet per second.

When the projectile impacted its effects were beyond question. The average crater was nearly 40 feet around and 14 feet deep.

With the Little David essentially a super-size artillery piece its fielding seemed imminent as the invasion of Japan loomed. However, before the Little David was shipped out, Japan surrendered with the dropping of the atomic bombs at Hiroshima and Nagasaki.The Not So Little David Siege Mortar - Dieselpunks
Type Heavy mortar
Place of origin United States
Service history
In service Testing only
Used by USA
Wars World War II
Specifications
Weight 40 tons (without carriage)
Barrel length 22 feet (6.7 m)
Shell 3,650 pounds (1,656 kg)
Caliber 36 inches (914 mm)
Barrels 1
Muzzle velocity 1250 ft/s (381 m/s)
Maximum firing range 6 miles (9.7 km)
Feed system Muzzle loading